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    Nonlinear Dynamics of Flexible Rotors Supported on Journal Bearings—Part I: Analytical Bearing Model

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    Date
    2018
    Type
    Article
    Author
    Miraskari, Mohammad
    Hemmati, Farzad
    S. Gadala, Mohamed
    Metadata
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    Abstract
    To determine the bifurcation types in a rotor-bearing system, it is required to find higher order derivatives of the bearing forces with respect to journal velocity and position. As closed-form expressions for journal bearing force are not generally available, Hopf bifurcation studies of rotor-bearing systems have been limited to simple geometries and cavitation models. To solve this problem, an alternative nonlinear coefficient-based method for representing the bearing force is presented in this study. A flexible rotor-bearing system is presented for which bearing force is modeled with linear and nonlinear dynamic coefficients. The proposed nonlinear coefficient-based model was found to be successful in predicting the bifurcation types of the system as well as predicting the system dynamics and trajectories at spin speeds below and above the threshold speed of instability.
    URI
    https://dspace.adu.ac.ae/handle/1/1736
    DOI
    https://doi.org/10.1115/1.4037730
    Citation
    http://tribology.asmedigitalcollection.asme.org/article.aspx?articleid=2652304
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    • Mechanical Engineering

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